JPH02239113A - Production of boehmite - Google Patents
Production of boehmiteInfo
- Publication number
- JPH02239113A JPH02239113A JP1061452A JP6145289A JPH02239113A JP H02239113 A JPH02239113 A JP H02239113A JP 1061452 A JP1061452 A JP 1061452A JP 6145289 A JP6145289 A JP 6145289A JP H02239113 A JPH02239113 A JP H02239113A
- Authority
- JP
- Japan
- Prior art keywords
- boehmite
- aluminum hydroxide
- paemite
- water
- dispersion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 229910001593 boehmite Inorganic materials 0.000 title abstract 6
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 title abstract 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 claims abstract description 8
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 claims abstract description 8
- 239000011976 maleic acid Substances 0.000 claims abstract description 8
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 claims abstract description 8
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims abstract description 6
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001630 malic acid Substances 0.000 claims abstract description 6
- 235000011090 malic acid Nutrition 0.000 claims abstract description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 11
- 239000000725 suspension Substances 0.000 abstract description 5
- 238000009826 distribution Methods 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 14
- 239000002994 raw material Substances 0.000 description 6
- 150000001735 carboxylic acids Chemical class 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- UIIMBOGNXHQVGW-UHFFFAOYSA-N sodium;hydron;carbonate Chemical compound [Na+].OC(O)=O UIIMBOGNXHQVGW-UHFFFAOYSA-N 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000004131 Bayer process Methods 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 101100441097 Dictyostelium discoideum crlG gene Proteins 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012778 molding material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/111—Fine ceramics
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/447—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes
- C01F7/448—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by wet processes using superatmospheric pressure, e.g. hydrothermal conversion of gibbsite into boehmite
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/30—Three-dimensional structures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Catalysts (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、小粒径で均一な粒度分布をもつペーマイトの
製造方法に関するものであυ、詳しくは、例えば易焼結
性アルミナの製造原料として好適なペーマイトの製造方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing paemite having a small particle size and a uniform particle size distribution.Specifically, the present invention relates to a method for producing paemite, which is suitable as a raw material for producing easily sinterable alumina, for example. Regarding.
近年、電子部品用磁器、内燃機関の点火栓碍子等の原料
あるいは触媒担体の原料として、高アルミナ質材料が多
量に使用されているが、その原料であるアルミナは、成
形後高密度（緻密〕に焼結〔以下「易焼結性」と呼ぶ〕
させる為に、粒子はｌμｍ以下の微粒子で出来るだけ粒
度の揃ったものが要求され、且つアルミナに含有される
Ｎ ａ２０は電気絶縁性や耐熱性を低下させたシ，触媒
担体としての強度を低下させる為、出来る限シその含有
量を少なくすることが要求されている。In recent years, a large amount of high alumina materials have been used as raw materials for porcelain for electronic parts, spark plug insulators for internal combustion engines, and raw materials for catalyst carriers, but the raw material, alumina, has a high density (dense) after forming. (hereinafter referred to as “easily sinterable”)
In order to achieve this, the particles are required to be fine particles of 1 μm or less and as uniform in particle size as possible, and the Na20 contained in alumina reduces electrical insulation and heat resistance, and reduces the strength as a catalyst carrier. Therefore, it is required to reduce the content as much as possible.
現在、工業的に安価、多量に生産されているアルミナは
、バイヤー法によって製造された水酸化アルミニウムを
焼成することによって製造されている為、工程上、通常
０． ２〜ｏ． ｙ重量係のＮａｎｏが含有され、その
ままでは上記目的に匝用することは出来ない。Alumina, which is currently produced industrially at low cost and in large quantities, is produced by firing aluminum hydroxide produced by the Bayer process, so it is usually 0% due to the process. 2~o. Contains Nano of y weight ratio, and cannot be used as is for the above purpose.
Ｎａ２０の含有量を低減する方法として、水酸化アルミ
ニウムの水性スラリーをオートクレープ中で／７７゜Ｃ
以上で処理してペーマイト化し、脱水後水洗する方法（
ＵＳＰ ．２．ククグ，７ｙグ、ＵＳＰ３．６ ．２
ｇ．デ／クノが提案されている。この方法は、水酸化
アルミニウムがペーマイトに転移する際に、水酸化アル
ミニウムの結晶中あるいは結晶粒界中に存在するソーダ
が放出される為、水洗のみで容易にＮａ２０の含有量を
低減することが可能である。しかし、ペーマイトが結晶
性の良い大粒子に成長する為、生成したペーマイトを焼
成して製造したアルミナも３〜５０μｍ程度の大粒径と
なシ、目的とする易焼結性のアルミナが得られず、この
アルミナを成形後、焼結を行っても高密度化しない為、
高強度１高耐摩耗性の絶縁材料等の成形材料を得ること
が出来なかった。As a method to reduce the Na20 content, an aqueous slurry of aluminum hydroxide was heated to 77°C in an autoclave.
Method of processing above to make paemite, dehydrating and washing with water (
USP. 2. Kukugu, 7ygu, USP3.6. 2
g. De/kuno is proposed. In this method, when aluminum hydroxide transforms into paemite, the soda present in the crystals or grain boundaries of aluminum hydroxide is released, so it is possible to easily reduce the Na20 content by simply washing with water. It is possible. However, since paemite grows into large particles with good crystallinity, the alumina produced by firing the generated paemite also has a large particle size of about 3 to 50 μm, making it difficult to obtain the desired alumina with easy sinterability. First, even if this alumina is sintered after being formed, it will not become denser.
It was not possible to obtain a molding material such as an insulating material with high strength and high wear resistance.
本発明者らは、先に、水中に分散させた水酸化アルミニ
ウムを加熱加圧下処理しペーマイトを得る際に、コ個以
上のカルボキシル基を有する水溶性カルボン酸を添加す
ることにより、小粒径で均一な粒度分布をもち、且つ、
低ソーダ含量のペーマイトを得、これを焼成して易焼結
性゛アルミナを製造する方法を提案した（特開昭５ター
７ｇ９２６号）。The present inventors first obtained a small particle size by adding a water-soluble carboxylic acid having 0 or more carboxyl groups when processing aluminum hydroxide dispersed in water under heat and pressure to obtain paemite. has a uniform particle size distribution, and
We proposed a method for producing easily sinterable alumina by obtaining paemite with a low soda content and firing it (Japanese Patent Application Laid-Open No. 1973-7G926).
本発明は、上記発明Ｋおけるペーマイトに関する知見を
基に更に検討を重ねた結果，筺用するカルボン酸の種類
によって得られるペーマイトの粒径が異なシ、上記公知
文献に記載のないある特定のカルボン酸は一層小粒径の
ペーマイトを与えるとの知見を得、本発明を完成するに
至った。As a result of further studies based on the knowledge regarding paemite in the above-mentioned invention K, the present invention has revealed that the particle size of the paemite obtained differs depending on the type of carboxylic acid used, and that a certain specific carboxylic acid not described in the above-mentioned known literature The present invention was completed based on the finding that acid gives paemite with a smaller particle size.
すなわち本発明の要旨は、水中に分散させた水酸化アル
ミニウムをマレイン酸及び／又はリンゴ酸の存在下に加
熱加圧下処理することを特徴とするペーマイトの製造方
法に存する。That is, the gist of the present invention resides in a method for producing paemite, which comprises treating aluminum hydroxide dispersed in water under heat and pressure in the presence of maleic acid and/or malic acid.
以下、本発明を説明する。The present invention will be explained below.
本発明で更用する水酸化アルミニウムは特に限定される
ものではなく、例えば、バイヤー法工程よシ得られた水
酸化アルミニウム等が丈用できる。その粒径はあまり太
きすぎるとペーマイト化に高湛，長時間の処理が必要と
なシ、又小さすぎるど取扱いが困難となる為、通常ｏ．
ｉμｍ以上、好ましくは０．５−ｓｏμｍの水酸化アル
ミニウムが好ましい。The aluminum hydroxide used in the present invention is not particularly limited, and for example, aluminum hydroxide obtained by the Bayer process can be used. If the particle size is too large, it will require a long and expensive process to turn it into paemite, and if it is too small, it will be difficult to handle, so it is usually o.
Aluminum hydroxide of i[mu]m or more, preferably 0.5-so[mu]m is preferred.
本発明で使用するカルボン酸は、マレイン酸及び／又は
リンゴ酸でアシ、リンゴ酸はＤ型、Ｌ型のいずれでもよ
いが通常は両者の当量混合物であるＤＬ型が更用される
。そして、これらの使用量は水酸化アルミニウムに対し
Ｏ，夕〜３０重量チ、好ましくはコ〜コＯ重量チである
。The carboxylic acid used in the present invention is maleic acid and/or malic acid, and malic acid may be either D type or L type, but usually DL type, which is an equivalent mixture of both, is used. The amount of these to be used is 0 to 30 parts by weight, preferably 0 to 30 parts by weight, based on aluminum hydroxide.
上記水酸化アルミニウムとマレイン酸又はり／ゴ酸を水
に分散させ、加熱加圧下水熱処理しペーマイトを得る。The aluminum hydroxide and maleic acid or phosphoric acid are dispersed in water and subjected to hydrothermal treatment under heat and pressure to obtain paemite.
水量は、固形分に対して／ − ３ ０重量倍、好まし
くは一〜３０重量倍である。The amount of water is /-30 times the solid content, preferably 1 to 30 times the weight.
水熱反応の条件は、使用する水酸化アルミニウムの粒径
によって異なるが、通常５ ／タＯ〜コざ０ ’Ｃ Ｌ
！ｒ 〜Ａ ！ｒ ｋ９／ｃｒｌＧで０．／〜２０時間
、好ましくは／ ？ ｏ 〜２ｇ ｏ′ｃ， ｇ 〜
ｙ ｏｋｇ／ｃｔｌＧでＯ．Ｓ〜／Ｏ時間の範囲で行え
ばよい。The conditions for the hydrothermal reaction vary depending on the particle size of the aluminum hydroxide used, but are usually 5 / 0 to 0 'C L
! r~A! r k9/crlG and 0. / ~ 20 hours, preferably / ? o ~2g o'c, g ~
O. with yokg/ctlG. It may be carried out within the range of S to /O time.
この様にして得られたペーマイト懸濁液を常法通シ水洗
、乾燥することＫよシ０．０３Ｍｉｋ％以下の低ソーダ
含量で、結晶子サイズが／ｌＯ八以下のペーマイトが回
収される。The paemite suspension thus obtained is washed with water and dried in a conventional manner to recover paemite with a low soda content of less than 0.03 Mik% and a crystallite size of less than /lO8.
本発明のカルボン酸の添加が効果を発現する理由は必ず
しも明確では々いが、その理由の一つとしてｓ ｐＨ
を低下させることによシ水酸化アルミニウムの溶解度を
上昇させ、核生成速度を速くすること、並びに水酸化ア
ルミニウムあるいはペーマイトのある特定の結晶面に吸
着して、いわゆる媒晶効果の役割を演じることによシ、
粒子を微細にしていることが考えられる。The reason why the addition of carboxylic acid of the present invention exhibits an effect is not necessarily clear, but one of the reasons is that s pH
Increasing the solubility of aluminum hydroxide by reducing the Yoshi,
It is thought that the particles are made finer.
とりわけ特定の酸を欧用する本発明によれば得られるペ
ーマイトは結晶子サイズ（ペーマイト（Ｏコθ）のＸ線
回折の半価幅よシ測定ラが／／θ人以下で比表面積がコ
θｏｙ（／ｙ以上の極めて微細な粒子であり、Ｎａ含有
量もＳＯＯｐｐｍ以下である。In particular, the paemite obtained according to the present invention, which uses a specific acid, has a crystallite size (the half width of X-ray diffraction of paemite (0) They are extremely fine particles of θoy(/y or more), and the Na content is also SOOppm or less.
このペーマイトの用途としては例えば、触媒担体及び易
焼結性アルミナの原料等が挙げられる。Examples of uses of this paemite include catalyst carriers and raw materials for easily sinterable alumina.
以下Ｋ実施例を挙げて、更に本発明を具体的に説明する
が本発明はその要旨を超えない限シ、下記実施例によっ
て限定されるものではない。The present invention will be described in more detail below with reference to K Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.
実施例ｌ
水酸化アルミニウム［： Ａｌ （ＯＨ）， ．平均粒
径．：ｌ．．３ μ＠ ， Ｎａ２０ ０．．３ ９重
量係含有〕ｌ００部とマレイン酸６部に水ｉｏｏｏ部を
加えて懸濁液を得た。Example l Aluminum hydroxide [: Al (OH), . Average particle size. :l. ．． 3 μ@, Na20 0. ．． A suspension was obtained by adding 100 parts of water (containing 39 parts by weight) and 6 parts of maleic acid.
この懸濁液をオートクレープ中で２２０′Ｃ，コ４Ｉｋ
＆／＋ｒｉＧの条件下にλグ時間反応させてべ〜マイト
懸濁液を得た後、水洗ろ過し／００℃で７時間乾燥を行
った。こうして得られたペーマイトはＮａ，Ｏ量が０．
Ｏｌ重量係以下で、結晶子サイズが７０７Ａの比表面積
一７５ｍ″／ｙ粉体であった。This suspension was heated to 4Ik at 220'C in an autoclave.
A bemite suspension was obtained by reacting for λg under the conditions of &/+riG, followed by washing and filtration with water and drying at 00° C. for 7 hours. The paemite thus obtained has a Na and O content of 0.
It was a powder with a crystallite size of 707A and a specific surface area of -75 m''/y.
上記ペーマイトの粉体２ ｉ，３ｏ ｏ℃で／時間焼成
してα−ＡＩ２０．に変換した。次いで、この粉体ｙ７
／ ｔｏｒｖｃｕｌで嵩密度ｌ．ｓｑ？／ｃｒｔｌＶ
ｃ加圧成形した後、ｌ．！５０℃で一時間焼成したとこ
ろ、嵩密度．ｙ．ｇｔｉ？ｌｃｙ＆の成形体が得られた
。即ち、ＡＪ２０，の理論密度．ｙ．ｑｑｙ，／ｄのｑ
Ａ．λチまで焼結が進行した緻密な成形体が得られた。The above paemite powder was calcined at 2 i,30°C/hour to obtain α-AI20. Converted to . Next, this powder y7
/torvcul with bulk density l. sq? /crtlV
c After pressure molding, l. ! After baking at 50℃ for 1 hour, the bulk density was . y. gti? A molded body of lcy& was obtained. That is, the theoretical density of AJ20. y. qqy, q of /d
A. A dense molded body in which sintering progressed to λ was obtained.
比較例７〜６
実施例ｌにおいて、マレイン酸忙代えて各種の水溶性ジ
カルボンｔＲを用いてペーマイトｔ製造した。Comparative Examples 7 to 6 In Example 1, paemite t was produced using various water-soluble dicarboxylic tR instead of maleic acid.
得られたペーマイトの結晶子サイズを測定し，その結果
を実施例／の結果と併せて表一／に示した・
表
ｌ
（発明の効果〕
本発明により、触媒担体、易焼結性アルミナの原料とし
て優れた極めて微細でＮａ含有量の少ないペーマイトを
得ることができる。The crystallite size of the obtained paemite was measured, and the results are shown in Table 1 along with the results of Examples. Extremely fine paemite with a low Na content, which is excellent as a raw material, can be obtained.
ほかｌ名Others
Claims (1)
酸及び／又はリンゴ酸の存在下に加熱加圧下処理するこ
とを特徴とするペーマイトの製造方法。(1) A method for producing paemite, which comprises treating aluminum hydroxide dispersed in water under heat and pressure in the presence of maleic acid and/or malic acid.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1061452A JPH02239113A (en) | 1989-03-14 | 1989-03-14 | Production of boehmite |
| US07/491,153 US5019367A (en) | 1989-03-14 | 1990-03-09 | Method for producing boehmite |
| AU51332/90A AU617972B2 (en) | 1989-03-14 | 1990-03-13 | Method for producing boehmite |
| EP90104849A EP0387856A1 (en) | 1989-03-14 | 1990-03-14 | Method for producing boehmite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1061452A JPH02239113A (en) | 1989-03-14 | 1989-03-14 | Production of boehmite |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02239113A true JPH02239113A (en) | 1990-09-21 |
Family
ID=13171453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1061452A Pending JPH02239113A (en) | 1989-03-14 | 1989-03-14 | Production of boehmite |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5019367A (en) |
| EP (1) | EP0387856A1 (en) |
| JP (1) | JPH02239113A (en) |
| AU (1) | AU617972B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302235A (en) * | 2000-04-25 | 2001-10-31 | Sumitomo Chem Co Ltd | METHOD FOR PRODUCING alpha-ALUMINA PARTICLE |
| JP2001302236A (en) * | 2000-04-25 | 2001-10-31 | Sumitomo Chem Co Ltd | alpha-ALUMINA PARTICLE AND METHOD FOR PRODUCING THE SAME |
| WO2004080897A1 (en) * | 2003-03-10 | 2004-09-23 | Kawai-Lime Ind. Co., Ltd. | Heat-resistant aluminum hydroxide and method for preparation thereof |
| CN115353134A (en) * | 2022-09-02 | 2022-11-18 | 宁波大浦新材料科技有限公司 | Preparation method of high-purity large-grain boehmite |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2073471C (en) * | 1991-07-09 | 1998-05-19 | Yasuo Shibasaki | Process for producing fine flaky alumina particles and alumina-based plastic material |
| JP2887023B2 (en) * | 1992-03-30 | 1999-04-26 | ワイケイケイ株式会社 | Fine plate-like boehmite particles and method for producing the same |
| DE69634164T2 (en) * | 1995-08-24 | 2005-12-22 | Kinsei Matec Co., Ltd., Osaka | Aluminum oxide particles with increased dispersibility and plasticity and process for their preparation |
| US5863515A (en) * | 1996-02-20 | 1999-01-26 | California Institute Of Technology | Mesoporous alumina and process for its preparation |
| DE19812279C1 (en) * | 1998-03-20 | 1999-05-12 | Nabaltec Gmbh | Flame resistant polymer mixture |
| WO2001083373A2 (en) * | 1999-09-28 | 2001-11-08 | 3M Innovative Properties Company | Boehmite powder |
| EP1112961B1 (en) | 1999-12-27 | 2004-09-15 | Sumitomo Chemical Company, Limited | Aluminium hydroxide and tyre tread rubber composition and pneumatic tyre employing the aluminium hydroxide |
| CN103466669B (en) * | 2013-09-27 | 2014-11-05 | 中国海洋石油总公司 | Method of using aluminium hydroxide to make pseudo-boehmite in hydrothermal synthesis mode |
| CN105836770B (en) * | 2016-03-24 | 2017-11-21 | 中铝山东有限公司 | A kind of preparation method of high temperature resistant boehmite |
| CN112479240A (en) * | 2020-11-30 | 2021-03-12 | 上海簇睿低碳能源技术有限公司 | Preparation method of high-viscosity pseudo-boehmite |
| CN112456528B (en) * | 2020-11-30 | 2022-09-27 | 中国铝业股份有限公司 | Boehmite and preparation method and application thereof |
| CN113735151B (en) * | 2021-09-24 | 2023-06-23 | 中铝郑州有色金属研究院有限公司 | Low-iron boehmite and preparation method and application thereof |
| KR20230066806A (en) * | 2021-11-08 | 2023-05-16 | 에스케이이노베이션 주식회사 | Method for manufacturing boehmite nanoparticles and apparatus for manufacturing thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2449650A1 (en) * | 1979-02-26 | 1980-09-19 | Rhone Poulenc Ind | PROCESS FOR THE PREPARATION OF ALUMINUM AT LEAST PARTIALLY IN THE FORM OF ULTRA-FINE BOEHMITE |
| JPS5978926A (en) * | 1982-10-29 | 1984-05-08 | Mitsubishi Chem Ind Ltd | Manufacture of easily sinterable alumina |
| JPS6167258A (en) * | 1984-09-08 | 1986-04-07 | Ricoh Co Ltd | Photoelectric converter |
| DE3702174C1 (en) * | 1987-01-26 | 1988-05-26 | Erwin Jenkner | Method and device for removing plate parts separated in a panel saw along a parting plane from a workpiece plate |
-
1989
- 1989-03-14 JP JP1061452A patent/JPH02239113A/en active Pending
-
1990
- 1990-03-09 US US07/491,153 patent/US5019367A/en not_active Expired - Fee Related
- 1990-03-13 AU AU51332/90A patent/AU617972B2/en not_active Ceased
- 1990-03-14 EP EP90104849A patent/EP0387856A1/en not_active Ceased
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001302235A (en) * | 2000-04-25 | 2001-10-31 | Sumitomo Chem Co Ltd | METHOD FOR PRODUCING alpha-ALUMINA PARTICLE |
| JP2001302236A (en) * | 2000-04-25 | 2001-10-31 | Sumitomo Chem Co Ltd | alpha-ALUMINA PARTICLE AND METHOD FOR PRODUCING THE SAME |
| JP4524847B2 (en) * | 2000-04-25 | 2010-08-18 | 住友化学株式会社 | Method for producing α-alumina particles |
| JP4556284B2 (en) * | 2000-04-25 | 2010-10-06 | 住友化学株式会社 | α-alumina particles and method for producing the same |
| WO2004080897A1 (en) * | 2003-03-10 | 2004-09-23 | Kawai-Lime Ind. Co., Ltd. | Heat-resistant aluminum hydroxide and method for preparation thereof |
| JPWO2004080897A1 (en) * | 2003-03-10 | 2006-06-08 | 河合石灰工業株式会社 | Heat resistant aluminum hydroxide and method for producing the same |
| JP4614354B2 (en) * | 2003-03-10 | 2011-01-19 | 河合石灰工業株式会社 | Heat resistant aluminum hydroxide and method for producing the same |
| US8138255B2 (en) | 2003-03-10 | 2012-03-20 | Kawai-Lime Ind. Co. Ltd. | Heat-resistant aluminum hydroxide and method for preparation thereof |
| CN115353134A (en) * | 2022-09-02 | 2022-11-18 | 宁波大浦新材料科技有限公司 | Preparation method of high-purity large-grain boehmite |
Also Published As
| Publication number | Publication date |
|---|---|
| AU617972B2 (en) | 1991-12-05 |
| AU5133290A (en) | 1990-09-20 |
| EP0387856A1 (en) | 1990-09-19 |
| US5019367A (en) | 1991-05-28 |
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